have you and your gf had full std testing done that included herpes testing prior to starting to be intimate together? if not, not a bad idea to do so so you know if you have to worry or not!!
aggressive oral sex can cause the symptoms you have. no newly acquired std would show symptoms the very next day.
can the special lubes cause skin issues? indeed they can. might want to go back to just plain ky and see if things get better too.
It is not herpes. Herpes will not come the next day if you did get it. It takes about 2 weeks to get an outbreak if you did get it.